/Engine/Source/Developer/MeshMergeUtilities/Public/IMeshMergeExtension.h
void OnCreatedProxyMaterial ( const [TArray](API\Runtime\Core\Containers\TArray)< [UStaticMeshComponent](API\Runtime\Engine\Components\UStaticMeshComponent) * > & MergedComponents, [UMaterialInterface](API\Runtime\Engine\Materials\UMaterialInterface) * ProxyMaterial )